What is one to do if his moustache became wet while drinking on Shabbos? May one press a napkin over his moustache to absorb the liquid, or is it squeezing?
The napkin may be placed over the area, and yo may rub it gently, in a way that it comes in contact with the liquid and the liquid automatically gets absorbed inside it. Although there are those who act stringently regarding this, this is the opinion of most poskim
Shmiras Shabbos Khilchoso 12-ftnt 64 in the name of Minchas Shabbos, Ketzos Hashulchan n the name of Ben Ish Chai, Orchos Shabbos 13 ftnt 89. In the name of R’ S. Z. Auerbach, and R’ Eliyashiv zt”l. It is known that the Steipler was careful about similar things.